<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body,
        html {
            width: 800px;
            /* background-color: aqua; */
        }

        div {
            /* background-color: red; */
            margin-left: 20px;
            float: left;

        }

        p {
            text-align: center;
        }
    </style>
</head>

<body>
    <button class="one">上一页</button>
    <button class="two">下一页</button>
    <div class="list">
        <p></p>
    </div>
</body>

</html>
<script src="./tool.js"></script>
<script>

    var page = 1
    function objseTis(obj) {
        var str = ''
        for (var key in obj) {
            str += `${key}=${obj[key]}&`
        }
        return str.slice(0, str.length)
    }
    function ajax(method, url, params, cd) {
        // 1.创建一个xhr对象
        var xhr = new XMLHttpRequest()

        //2.配置xhr对象
        xhr.open(method, url + "?" + objseTis(params))
        //3.用回调函数来接收返回的响应
        xhr.onreadystatechange = function () {
            if (xhr.readyState == 4) {
                cd(JSON.parse(xhr.responseText));
            }
        }
        //4.发送请求
        xhr.send()
    }

    //渲染第一页

    ajax('get', `https://yantianfeng.com/api/emotion`, { page: page, count: 10 }, function (data) {
        console.log(data);
        var str = data.emotions.map((item, index) => {
            return `<div> <img src="${item.url}" /> <p> ${item.title} </p> </div>`
        }).join('')
        document.querySelector('.list').innerHTML = str
    })



    // 上一页
    document.querySelector('.one').onclick = function () {
        if (page > 1) {
            ajax('get', `https://yantianfeng.com/api/emotion`, { page: --page, count: 10 }, function (data) {
                console.log(data);
                var str = data.emotions.map((item, index) => {
                    return `<div> <img src="${item.url}" /> <p> ${item.title} </p> </div>`
                }).join('')
                document.querySelector('.list').innerHTML = str
            })
        }
    }

    //下一页
    document.querySelector('.two').onclick = function () {
        if (page < 4) {
            ajax('get', `https://yantianfeng.com/api/emotion`, { page: ++page, count: 10 }, function (data) {
                console.log(data);
                var str = data.emotions.map((item, index) => {
                    return `<div> <img src="${item.url}" /> <p> ${item.title} </p> </div>`
                }).join('')
                document.querySelector('.list').innerHTML = str
            })
        }
    }

</script>